Located approximately 15 miles east of the Marine MLR, the Camp Casey reserve complex consisted of three major areas. They were: the central one, Casey, which gave its name to the entire installation and would house the new division CP and 5th Marines; Indianhead, to the north, where the 7th Marines, 1st KMC Regiment, Division Reconnaissance Company, machine gun and NCO schools were to be established; and Britannia, to the south, assigned to the 1st Marines. Motor transport, engineer, and medical units in support of the respective regiments were to locate nearby. On 27 April, the day after resumption of truce talks at Panmunjom, Company A engineers began the work of clearing the camp site, erecting prefabricated buildings, and pioneering roads in the 7th Marines northern area. Two days later the 1st KMC Engineer Company was also detailed to Indianhead for work on the 1st KMC Regimental camp. Company C engineers and Company A, 1st Shore Party Battalion, attached to the Engineer Battalion, meanwhile moved into the Casey sector to ready the relocated Division CP and the 5th Marines camp. Tactical relief of the 1st Marine Division officially began 1 May. By the time it was over, four days later, more than 2,370 truckloads of Marine personnel and equipment had been used in the transfer to Camp Casey. Described another way: if placed bumper to bumper in a continuous convoy, this would have extended more than six miles, the length of the MLR held by a Marine regiment in any major defense sector. As a preliminary step in the relief, on 29 April the division assumed operational control of several incoming Army artillery units (the 8th, 64th, 69th, and 90th Field Artillery Battalions, and the 21st Antiaircraft Automatic Weapons Battalion) plus elements of the Turkish command, including the TAFC Field Artillery Battalion. By midafternoon, the first of the Army infantry relief personnel had also arrived in the division sector, when elements of the three battalions of the 35th Infantry Regiment had reported in to respective 1st Marines[412] host units, preparatory to assuming responsibility for the center sector of the Marine line. [412] The regiment was newly-commanded by Colonel Nelson, the former UN Personnel and Medical Processing Unit officer, who succeeded Colonel Adams as CO, 1st Marines on 1 May.